<template>
  <div class="upload-file">
    <el-upload
      multiple
      :action="uploadFileUrl"
      :before-upload="handleBeforeUpload"
      :file-list="fileList"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-success="handleUploadSuccess"
      :show-file-list="false"
      :headers="headers"
      class="upload-file-uploader"
      ref="fileUpload"
    >
      <!-- 上传按钮 -->
      <el-button class="btn size type border-1 ">{{fileTitle}}</el-button>
      <!-- 上传提示 -->
      <div class="el-upload__tip" slot="tip" v-if="showTip">
        请上传
        <template v-if="fileSize"> 大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b> </template>
        <template v-if="fileType"> 格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b> </template>
        的文件
      </div>
    </el-upload>

    <!-- 文件列表 -->
    <transition-group v-if="isShowFile"  class="upload-file-list el-upload-list el-upload-list--text" name="el-fade-in-linear" tag="ul">
      <li :key="file.url" class="el-upload-list__item ele-upload-list__item-content" v-for="(file, index) in fileList">
        <el-link :href="file.url" :underline="false" target="_blank">
          <span class="el-icon-document"> {{ getFileName(file.name) }} </span>
        </el-link>
        <div class="ele-upload-list__item-content-action">
          <el-link :underline="false" @click="handleDelete(index)" type="danger">删除</el-link>
        </div>
      </li>
    </transition-group>
  </div>
</template>

<script>
import { getToken } from "@/utils/auth";

export default {
  name: "FileUpload",
  props: {
    // 值
    value: [String, Object, Array],
    // 数量限制
    limit: {
      type: Number,
      default: 5,
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5,
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ["doc", "docx","xls","xlsx", "ppt", "txt", "pdf"],
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    },
    //按钮名称
    fileTitle:{
      type:String,
      default:'选取文件'
    },
// 是否显示上传的文件列表
    isShowFile: {
      type: Boolean,
      default: true
    },
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      uploadFileUrl: process.env.VUE_APP_BASE_API + "/file/upload", // 上传文件服务器地址
      headers: {
        Authorization: "Bearer " + getToken(),
      },
      fileList: [],
    };
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          let temp = 1;
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',');
          // 然后将数组转为对象数组
          this.fileList = list.map(item => {
            if (typeof item === "string") {
              item = { name: item, url: item };
            }
            item.uid = item.uid || new Date().getTime() + temp++;
            return item;
          });
        } else {
          this.fileList = [];
          return [];
        }
      },
      deep: true,
      immediate: true
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize);
    },
  },
  methods: {
    // 上传前校检格式和大小
    handleBeforeUpload(file) {
      // 校检文件类型
      if (this.fileType) {
        const fileName = file.name.split('.');
        const fileExt = fileName[fileName.length - 1];
        const isTypeOk = this.fileType.indexOf(fileExt) >= 0;
        if (!isTypeOk) {
          this.$modal.msgError(`文件格式不正确, 请上传${this.fileType.join("/")}格式文件!`);
          return false;
        }
      }
      // 校检文件大小
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize;
        if (!isLt) {
          this.$modal.msgError(`上传文件大小不能超过 ${this.fileSize} MB!`);
          return false;
        }
      }
      this.$modal.loading("正在上传文件，请稍候...");
      this.number++;
      return true;
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`);
    },
    // 上传失败
    handleUploadError(err) {
      this.$modal.msgError("上传文件失败，请重试");
      this.$modal.closeLoading()
    },
    // 上传成功回调
    handleUploadSuccess(res, file) {
      if (res.code === 200) {
        this.uploadList.push({ name: res.data.url, url: res.data.url });

        // this.uploadedSuccessfully();
      } else {
        this.number--;
        this.$modal.closeLoading();
        this.$modal.msgError(res.msg);
        this.$refs.fileUpload.handleRemove(file);
        // this.uploadedSuccessfully();
      }
      if (this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList);
        this.uploadList = [];
        this.number = 0;
        this.$emit("input", this.listToString(this.fileList));
        this.$modal.closeLoading();
      }
    },
    // 上传成功回调
    // uploadedSuccessfully() {
    //     if (this.number > 0 && this.uploadList.length === this.number) {
    //     this.fileList = this.fileList.concat(this.uploadList);
    //     this.uploadList = [];
    //     this.number = 0;
    //     console.log(this.fileList,'上传的数据')
    //     this.$emit("input", this.listToString(this.fileList));
    //     this.$modal.closeLoading();
    //   }
    // },
    // 删除文件
    handleDelete(index) {
      this.fileList.splice(index, 1);
      this.$emit("input", this.listToString(this.fileList));
    },
    // // 上传结束处理
    // uploadedSuccessfully() {
    //   if (this.number > 0 && this.uploadList.length === this.number) {
    //     this.fileList = this.fileList.concat(this.uploadList);
    //     this.uploadList = [];
    //     this.number = 0;
    //     this.$emit("input", this.listToString(this.fileList));
    //     this.$modal.closeLoading();
    //   }
    // },

    // 获取文件名称
    getFileName(name) {
      if (name.lastIndexOf("/") > -1) {
        return name.slice(name.lastIndexOf("/") + 1);
      } else {
        return "";
      }
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = "";
      separator = separator || ",";
      for (let i in list) {
        strs += list[i].url + separator;
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : '';
    }
  }
};
</script>

<style scoped lang="scss">
.upload-file-list .el-upload-list__item {
  border: 1px solid #e4e7ed;
  line-height: 2;
  margin-bottom: 10px;
  position: relative;
}
.upload-file-list .ele-upload-list__item-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: inherit;
}
.ele-upload-list__item-content-action .el-link {
  margin-right: 10px;
}
// $btnColors: #5c6ffe #9292C1;
$btnColors: #1364ff #9292C1;
$sizeArr: (
  (
    cssName: small,
    width: 70px,
    height: 34px,
    fontSize: 12px,
  ),
  (
    cssName: default,
    width: 120px,
    height: 40px,
    fontSize: 14px,
  )
);

/* 按钮颜色 默认type-1 */
/* type-1、type-2... */
/* 边框按钮 border-1、border-2... */
@for $i from 1 through length($btnColors) {
  .btn.type-#{$i} {
    $color: nth($btnColors, $i);
    background: $color;
    color: #fff;
    border-radius: 6px;
    &:hover {
      background: lighten($color, 10%);
    }
    &:active {
      background: darken($color, 10%);
    }
    &:disabled {
      background: lighten($color, 20%);
      color: lighten($color, 40%);
    }
  }
  .btn.border-#{$i} {
    $color: nth($btnColors, $i);
    border: 1px solid $color;
    color: $color;
    background: white;
    &:hover {
      color: lighten($color, 10%);
    }
    &:active {
      color: darken($color, 10%);
    }
    &:disabled {
      color: lighten($color, 20%);
      background: lighten($color, 40%);
    }
  }
}

/* 按钮大小 */
@for $i from 1 through length($sizeArr) {
  $item: nth($sizeArr, $i);

  .#{map-get($item, cssName)} {
    width: map-get($item, width);
    height: map-get($item, height);
    font-size: map-get($item, fontSize);
  }
}
</style>
